English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

High quality reconstructions of the three dimensional velocity and densityfields of the local Universe are essential to study the local Large ScaleStructure. In this paper, the Wiener Filter reconstruction technique is appliedto galaxy radial peculiar velocity catalogs to understand how the Hubbleconstant (H0) value and the grouping scheme affect the reconstructions. WhileH0 is used to derive radial peculiar velocities from galaxy distancemeasurements and total velocities, the grouping scheme serves the purpose ofremoving non linear motions. Two different grouping schemes (based on theliterature and a systematic algorithm) as well as five H0 values ranging from72 to 76 km/s/Mpc are selected. The Wiener Filter is applied to the resultingcatalogs. Whatever grouping scheme is used, the larger H0 is, the larger theinfall onto the local Volume is. However, this conclusion has to be stronglymitigated: a bias minimization scheme applied to the catalogs after groupingsuppresses this effect. At fixed H0, reconstructions obtained with catalogsgrouped with the different schemes exhibit structures at the proper location inboth cases but the latter are more contrasted in the less aggressive schemecase: having more constraints permits an infall from both sides onto thestructures to reinforce their overdensity. Such findings highlight theimportance of a balance between grouping to suppress non linear motions andpreserving constraints to produce an infall onto structures expected to belarge overdensities. Such an observation is promising to perform constrainedsimulations of the local Universe including its massive clusters.

How does the grouping scheme affect the Wiener Filter reconstruction of the local Universe?